Acrylicwindow inserts

There are many energy saving solutions on the market today that can assist in reducing energy bills but when it comes to windows, nothing compares to a retrofitted secondary magnetic acrylic window. Acrylic windows are energy efficient and an effective window construction material for the following reasons.

Figure 3: Cones describe the light incident on a sample point from the condenser (left, gold), the light transmitted through the sample (right, yellow), and the range of light the objective can collect (right, orange). The cones' angles are measured from the optical axis. The angular ranges of the light cones incident on and transmitted by the sample are approximately the same (θcd ), since light that is not absorbed or scattered by the sample travels in an approximately straight line. The angular range (θobj ) accepted by the objective lens is can be different. The numerical apertures of the condenser (NAcd ) and objective (NAobj ) are often used to compare the angular ranges of the transmitted light to the light the objective lens can gather.

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As an example, when the objective lens has a 0.7 NA with air (n = 1) between the lens and sample, the lens' angle of acceptance is θ = θobj = 44.43°. For the system illustrated in Figure 2, the NA of the illumination and the NA of the collected light are the same, since both light paths pass through the objective lens.

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Figure 1: In transmitted light microscopes, light from the light source is directed to the sample by the condenser optical system. The objective lens is used to collect the transmitted light. This collected light is then routed to create an image at a camera or eyepiece.

which depends on the half-angle (θ ) of the cone, as well as the surrounding medium's refractive index (n ). The higher the NA, the wider the cone describing the angular range. This angle is measured from the optical axis.

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The Soundblock® Magnetic Window System has been tested by a NATA registered laboratory. They have measured the magnitude of improvement that Soundblock® can provide when used in conjunction with a conventional open-able sliding window. Similar improvements in performance may be anticipated when Soundblock® is used with other types of windows.

One of our our consultants will be in touch and can arrange a site visit (if required) to assist you with your double glazing solution.

ResolutionThe resolution (δ ) of the microscope describes its ability to image two closely spaced points as a separable pair, instead of as a single point. A common equation,

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used to estimate this minimum separation includes only the wavelength () and the NA of the objective (NAobj ). While this equation seems to suggest the NA of the condenser (NAcd ) does not affect resolution, this is not the case. This equation actually assumes that NAcd ≥ NAobj .

Condenser and ObjectiveIn transmitted light microscopy, the condenser collects light from the source and illuminates the sample (Figure 1). The condenser optical system typically includes several optical elements, which can be aligned to provide uniform illumination of the sample plane. The objective lens is located on the opposite side of the sample plane and collects the light that is transmitted through the sample. This light is then routed to create an image at an eyepiece or camera.

The condenser's numerical aperture (NA) strongly impacts a microscope's resolution, since the angular range of the light incident on the sample affects the angular range of light transmitted or reflected by the sample. According to a general rule for optimizing resolution, the condenser NA should be as least as large as the objective NA. In other words, the cone of light provided by the condenser should have an angular range that matches or exceeds that accepted by the objective lens.

Numerical ApertureThe condenser provides light to the sample plane over a range of different angles (Figure 3). A cone, drawn with its tip at a point on the sample and its base encircling the light from the condenser, can be used to quantify the range of incident angles (θcd ). The light transmitted by this point on the sample has approximately the same angular range. A different cone can be used to depict the angular range of light (θobj ) the objective lens is capable of gathering.

Alternately, the microscope can be configured so the objective both illuminates and collects light from the sample (Figure 2). In this case, there is no separate condenser lens system.

Figure 2: In epi-illumination microscopes, the objective provides the light that illuminates the sample. It also collects the light reflected and scattered from the sample. Due to this, and in contrast to the case illustrated in Figure 1, both the illumination and imaging angles depend only on the objective.

Installing one of Soundblock’s retrofitted double glazed window systems can greatly reduce the noise within your home or office and also reduce heat transfer from windows will assist you in regulating and maintaining the inside temperature of your building. By doing so you reduce your dependency on the need for curtains and blinds as they’re only required to shut out sunlight and street lights shining into your building.